EP2551705B1 - Backlight unit and display device using the same - Google Patents

Backlight unit and display device using the same Download PDF

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Publication number
EP2551705B1
EP2551705B1 EP12153286.5A EP12153286A EP2551705B1 EP 2551705 B1 EP2551705 B1 EP 2551705B1 EP 12153286 A EP12153286 A EP 12153286A EP 2551705 B1 EP2551705 B1 EP 2551705B1
Authority
EP
European Patent Office
Prior art keywords
reflector
backlight unit
region
light source
flat surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12153286.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2551705A1 (en
Inventor
Se Jin Ko
Ji In Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Innotek Co Ltd
Original Assignee
LG Innotek Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Priority to EP14188882.6A priority Critical patent/EP2840421B1/en
Publication of EP2551705A1 publication Critical patent/EP2551705A1/en
Application granted granted Critical
Publication of EP2551705B1 publication Critical patent/EP2551705B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • Present invention relates to a backlight unit and a display device.
  • a conventional display device may include a liquid crystal display (LCD), a plasma display panel (PDP) and the like.
  • LCD liquid crystal display
  • PDP plasma display panel
  • the LCD is not self-luminescent and it requires a backlight unit as a self-luminescent.
  • Such a backlight unit used in the LCD may be categorized into an edge backlight unit and a direct backlight, based on location of a light source.
  • light sources are disposed on right and left lateral surfaces or up and down lateral surfaces of an LCD panel.
  • Light may be dispersed to a front surface by a light guide plate uniformly. Because of that, the edge backlight unit has good uniformity of light and it may enable the panel ultra-thin.
  • the direct backlight unit is used for a 20-inch-or-more (50.8 cm-or more) display.
  • light sources are disposed on a backside of a panel. Because of that, the direct backlight unit has an advantage of better luminous efficiency than the edge backlight unit and it is used for a large display requiring high brightness.
  • a cold cathode fluorescent lamp (CCFL) is used for the light source of the conventional edge backlight unit or the direct backlight unit.
  • the CCFL has a disadvantage of approximately 70% of color reproduction, compared with a cold cathode fluorescent lamp (CCFL) and another disadvantage of environmental pollution because of mercury added thereto.
  • RGB LED exceeds 100% of color production specifications of National Television System Committee (NTSC) and a more vivid image quality may be provided to a consumer.
  • NTSC National Television System Committee
  • US 2007/171676 A1 discloses a backlight unit with a hollow light-guide which is edge-illuminated by LEDs.
  • the reflectors constituting the hollow light-guide together with a light diffusion plate have particular shapes to increase the brightness uniformity on the light diffusion plate which constitutes the light exit surface of the backlight unit.
  • US 2006/274550 A1 discloses a backlight unit having a hollow light-guide, wherein particularly shaped reflectors reflect the light emitted by a light source into the hollow light pipe.
  • the present invention provides a backlight unit according to appended independent claim 1 and a display device comprising the same, as defined in appended claim 15.
  • Preferred embodiments of the backlight unit of the present invention are defined in the appended dependent claims 2-14.
  • FIG. 1 is a sectional view illustrating a backlight unit according to an embodiment of the present invention.
  • the backlight unit includes a light source module 100, a first reflector 200 and a second reflector 300.
  • the light source module 100 is located between the first reflector 200 and the third reflector 300.
  • the light source module 100 is adjacent to the first reflector 200.
  • the light source module 100 may be spaced apart a predetermined distance from the second reflector 300, simultaneously in contact with the first reflector 200.
  • the light source module 100 may be spaced apart a predetermined distance from the first reflector 200, simultaneously in contact with the second reflector 200.
  • the light module 100 may be spaced apart a predetermined distance from the first reflector 200 and the second reflector 300 or it may be in contact with the first reflector 200 and the second reflector 300.
  • the light source module 100 includes a substrate having an electrode pattern and at least one light source disposed on the substrate.
  • the light source of the light source module 100 may be a top view type light emitting diode.
  • the light source may be a side view type light emitting diode.
  • the substrate may be a printed circuit board (PCB) formed of a selected material from polyethylene terephtalate (PET), glass, polycarbonate (PC) and silicon (Si), or the substrate may be a film.
  • PCB printed circuit board
  • the substrate may be a unilayered PCB, a multilayered PCB, a ceramic substrate or a metal core PCB selectively.
  • a reflection coating film or a reflection coating material layer may be formed on the substrate and the substrate may reflect the light generated from the light source toward a central region of the second reflector 300.
  • the light source may be a light emitting diode (LED) chip and the light emitting diode chip may be configured of a blue LED chip, an ultraviolet light LED chip or it may be configured of a package combined with one or more of red, green, blue, yellow green and white LED chips.
  • LED light emitting diode
  • the white LED may be realized by combining a yellow phosphor on the blue LED or combining a red phosphor and a green phosphor on the blue LED, or by using a yellow phosphor, a red phosphor and a green phosphor on the blue LED simultaneously.
  • the first reflector 200 and the second reflector 300 are facing each other, spaced apart a predetermined distance, to have air guide between them.
  • the first reflector 200 may be formed of a reflection coating film or a reflection coating material and it may reflect the light generated from the light source module 100 toward the second reflector 300.
  • the back surface of the first reflector 200 faces the second reflector 300, with an inclined plane and a flat surface.
  • the inclined plane is directly adjacent to the light source module 100 and the flat surface is extended from an end of the inclined plane, with being located at the collinear position with respect to the light source module 100.
  • the inclined plane of the first reflector 200 may be inclined a predetermined angle downwardly from a top surface of the first reflector 200.
  • the flat surface of the first reflector 200 may be in parallel to the top surface of the first reflector 200.
  • the inclined plane of the first reflector may be a concave surface, a convex surface or a flat surface.
  • the reason why the predetermined area of the back surface disposed in the first reflector 200 is the inclined plane is that a hot spot of a light-entry region, the size of the first reflector 200 can be reduced by the first reflector 200 reflecting the light toward the second reflector 300. Because of that, a bezel region may be reduced advantageously.
  • the inclined plane is disposed in a predetermined region of the first reflector 200 and the first reflector 200 may include a metal material or a metal oxide, with a high reflectivity, such as aluminum (Al), silver (Ag), gold (Au) and titanium dioxide (TiO 2 ).
  • a saw-toothed reflection pattern may be formed in a predetermined region of the back side of the first reflector 200.
  • the reflection pattern may be a flat surface or a curved surface.
  • the reason why the reflection pattern is formed in the predetermined region of the first reflector 200 is that brightness may be increased in a central region of the backlight unit by reflecting the light generated from the light source module 100 toward the central region of the second reflector 300.
  • An inclined plane may be formed in a predetermined region of the second reflector 300 and the second reflector 300 may include a metal material or a metal oxide, with a high reflectivity, such as Al, Ag, Au and TiO 2 .
  • the inclined plane may be aligned with at least one of the light source module 100 and the first reflector 200.
  • the inclined plane of the second reflector 300 may be inclined a predetermined angle with respect to the surface of the first reflector 200 and it may be at least one of concave, convex and flat surfaces.
  • the second reflector 300 may include at least one inclined plane and at least one flat surface.
  • the flat surface of the second reflector 300 may be in parallel to the flat surface of the first reflector 200.
  • the second reflector 300 may include at least two inclined planes with at least one inflection point.
  • the curvatures of first and second inclined planes adjacent to each other with respect to the inflection point may be different from each other.
  • FIGS. 2A to 2C are sectional views illustrating the structure of the first reflector shown in FIG. 2 .
  • the back surface of the first reflector 200 may include a first region adjacent to the light source module 100 and a second region adjacent to the first region.
  • the first region is an inclined plane 201 and the second region is a flat surface 202.
  • the inclined plane 201 of the first region may be inclined a predetermined angle along downward direction of the first reflector 200 and the flat surface 202 of the second region may be in parallel to the top surface of the first reflector 200.
  • the flat surface 202 of the second region is extended from an end of the inclined plane 201, and the flat surface 202 and the light source module 100 are collinear.
  • the inclined plane 201 of the first reflector 200 is a concave surface with a predetermined curvature.
  • the inclined plane 201 of the first reflector 200 is a convex surface with a predetermined curvature.
  • the inclined plane 201 of the first reflector 200 is a flat surface with a predetermined inclined angle.
  • FIG. 3 is a sectional view illustrating arrangement of the flat surface disposed in the first reflector.
  • the light source module 100 includes a substrate 102 and at least one light source 101 disposed on the substrate 102.
  • the light source 101 has a top surface with a first width (W1) and the flat surface 202 of the first reflector 200 is disposed in a center of the first width (W1) of the light source 101.
  • a hot spot may be generated in the light-entry region.
  • the flat surface 202 of the first reflector 200 is disposed under the center of the first width (W1) (in a lower area of the width) of the light source 101, the light might be blocked or brightness might be degraded entirely.
  • the flat surface 202 of the first reflector 200 is disposed within the first width (W1), the hot spot is reduced in the light-entry region and the size of the first reflector 200 is reduced. Because of that, the bezel region of the display panel is reduced advantageously.
  • the inclined plane 201 of the first reflector 200 has a second width (W2) and the flat surface 202 of the first reflector has a third width (W3).
  • the second width (W2) of the inclined plane 201 may be identical to or different from the third width (W3) of the flat surface 202.
  • the second width (W2) of the inclined plane 201 may be larger than the third width (W3) of the flat surface 202.
  • FIGS. 4A to 4C are sectional views illustrating the first reflector that includes a specular-reflection region.
  • the back surface of the first reflector 200 may include a specular-reflection region to specular-reflect the light or a scattered-reflection region to scattered-reflect the light.
  • the back surface of the first reflector 200 includes an inclined plane 201 and a flat surface 202. Both of the inclined plane 201 and the flat surface 202 are specular-reflection regions.
  • a specular-reflection sheet is disposed on the inclined plane 201 and the flat surface 202, to specular-reflect the light.
  • the back surface of the first reflector 200 includes an inclined plane 201 and a flat surface 202.
  • the inclined plane 201 is the specular-reflection region and the flat surface 202 is the scattered-region.
  • a specular-reflection sheet is disposed on the inclined plane 201 to specular-reflect the light and a scattered-reflection sheet is disposed on the flat surface 202 to scattered-reflect the light.
  • the back surface of the first reflector 200 includes an inclined plane 201 and a flat surface 202.
  • the inclined plane 201 is a specular-reflection region and the flat surface 202 includes a specular-reflection region and a scattered-reflection region.
  • a specular-reflection sheet is disposed on the inclined plane 201 to specular-reflect the light.
  • the specular-reflection sheet is disposed on a predetermined region of the flat surface 202 and a scattered-reflection sheet is disposed on the other region to scattered-reflect the light.
  • the scattered-reflection sheet disposed on the flat surface 202 may be adjacent to the inclined plane 201 or between specular-reflection sheets.
  • the specular-reflection sheet is disposed on the first reflector 200, more lights may be reflected to the second reflector 300. If the scattered-reflection sheet is disposed on the first reflector, the light may be transmitted to a region of the second reflector 300 having low brightness and the low brightness may be compensated.
  • FIGS. 5A and 5B are sectional views illustrating a boundary region between the inclined plane and the flat surface of the first reflector.
  • the first reflector 200 includes an inclined plane 201 and a flat surface 202 formed on the back surface thereof.
  • a boundary region between the inclined plane 201 and the flat surface 202 may have a dihedral angle formed by them.
  • the boundary region between the inclined plane 201 and the flat surface 202 may include a convex surface with a predetermined curvature.
  • the boundary region between the inclined plane 201 and the flat surface 202 is the convex surface with the curvature is following. If the dihedral angle is formed in the boundary region between the inclined plane 201 and the flat surface 202, the incident light might be concentrated only on some region and overall brightness might fail to be uniform.
  • the boundary region between the inclined plane 201 and the flat surface 202 may be formed to be a convex surface with a predetermined curvature and uniform brightness may be provided.
  • FIGS. 6A and 6B are sectional views illustrating the thickness of the first reflector.
  • the first reflector 200 includes a first region adjacent to the light source module and a second region adjacent to the first region.
  • a back surface of the first region disposed in the first reflector 200 has an inclined plane 201 and a top surface of the first region has a flat surface.
  • a flat surface formed in a top surface of the second region is in parallel to a flat surface formed in a back surface of the second region.
  • the thickness (t1) of a predetermined area adjacent to the light source module may be smaller than the thickness (t2) of an area distant from the light source module.
  • the thickness of a predetermined area adjacent to the light source module may be larger than the thickness (t4) of an area distant from the light source module.
  • the first region may be a flat surface and the second region may be a stepped surface having two flat surfaces with different heights.
  • the first reflector 200 includes a first region adjacent to the light source module and a second region adjacent to the first region.
  • a back surface of the first region disposed in the first reflector 200 has an inclined plane 201 and a top surface of the first region has an inclined plane.
  • the back and top surfaces of the first region may have the same inclined planes, respectively.
  • a back surface of the second region disposed in the first reflector 200 has a flat surface 202 and a top surface of the second region has a flat surface.
  • the top surface of the second region may partially have an inclined plane and the flat surface of the top surface may be in parallel to the flat surface of the back surface.
  • the thickness (t1) of an area adjacent to the light source module is the same as the thickness (t2) of an area distant from the light source module.
  • the thickness (t3) of an area adjacent to the light source module is the same as the thickness (t4) distant from the light source module.
  • the first region may be an inclined plane and the second region may be combined with an inclined plane and a flat surface.
  • FIGS. 7A and 7B are sectional views illustrating the width of the top surface of the first reflector.
  • the top surface of the first reflector 200 may include a third region 203 adjacent to the light source module and a fourth region 204 adjacent to the third region 203.
  • the third region 203 disposed in the top surface of the first reflector 200 is corresponding to the inclined plane disposed in the back surface of the first reflector 200 and the fourth region 204 disposed in the top surface of the first reflector 200 is corresponding to the flat surface disposed in the back surface of the first reflector 200.
  • the third region 203 and the fourth region 204 are flat surfaces located on different lines.
  • the flat surface of the third region 203 is higher than the flat surface of the fourth region 204.
  • the width of the third region 203 may thus be different from the width of the fourth region 204.
  • the width of the flat surface formed in the third region 203 may be different from the width of the flat surface disposed in the fourth region 204.
  • the width of the flat surface disposed in the third region 203 may be larger than the width of the flat surface disposed in the fourth region 204.
  • an active region of the display can be increased by reducing the width of the fourth region 204 and by reducing the width of the bezel accordingly.
  • the widths of the third and fourth regions 203 and 204 may be the same.
  • the top surface of the first reflector 200 may include a third region 203 adjacent to the light source module and a fourth region 204 adjacent to the third region 203.
  • the third region 203 disposed in the top surface of the first reflector 200 is corresponding to the inclined plane disposed in the back surface of the first reflector 200 and the fourth region 204 disposed in the top surface of the first reflector 200 is corresponding to the flat surface disposed in the back surface of the first reflector 200.
  • the third region 203 is a downwardly inclined plane and the fourth region 204 is a flat surface in parallel to the back surface.
  • the width of the third region 203 is different from the width of the fourth region 204.
  • the width of the flat surface disposed in the third region 203 may be different from the width of the flat surface disposed in the fourth region 204.
  • an active region of the display can be increased by reducing the width of the fourth region 204 and by reducing the width of the bezel accordingly.
  • the widths of the third and fourth regions 203 and 204 may be the same.
  • the third region 203 and the fourth region 204 disposed in the top surface of the first reflector 200 may have the surfaces having the same appearance. Alternatively, they may have surfaces having different appearances, respectively.
  • the surfaces of the third and fourth regions 203 and 204 may be curved or flat and they may be fabricated in various shapes rather than the curved or flat shapes.
  • FIGS. 8A and 8B are sectional views illustrating a projection projected from the top surface of the first reflector.
  • the top surface of the first reflector 200 may include at least one projection projected with a predetermined height.
  • the top surface of the first reflector 200 includes a third region 203 adjacent to the light source module and a fourth region 204 adj acent to the third region 203.
  • the third and fourth regions 203 and 204 have flat surfaces located on a different line, respectively.
  • a first projection 211 and a second projection 212 are disposed on the flat surface of the third region 203.
  • a third projection 213 may be disposed on the flat surface of the fourth region 204.
  • the height (h1) of the first projection 211, the height (h2) of the second projection 212 and the height (h3) of the third projection 213 are the same.
  • at least some of the heights (h1, h2 and h3) possessed by the first, second and third projections 211, 212 and 213, respectively, may be the same.
  • at least one of the heights (h1, h2 and h3) possessed by the first, second and third projections 211, 212 and 213, respectively, may be different from the others.
  • the top surface of the first reflector 200 includes a third region 203 adjacent a fourth region 204 adjacent to the third region 203.
  • the third and fourth regions 203 and 204 have flat surfaces located on a different line, respectively.
  • a first projection 211 and a second projection 212 are disposed on the flat surface of the third region 203.
  • a third projection 213 may be disposed on the flat surface of the fourth region 204.
  • the height (h1) of the first projection 211, the height (h2) of the second projection 212 and the height (h3) of the third projection 213 may be the same. In some cases, at least some of the heights (h1, h2 and h3) possessed by the first, second and third projections 211, 212 and 213, respectively, may be the same. Alternatively, at least one of the heights (h1, h2 and h3) possessed by the first, second and third projections 211, 212 and 213, respectively, may be different from the others.
  • first, second and third projections 211, 212 and 213 may be employed to support or couple optical members or panel guide molds.
  • first and second projections 211 and 212 may be members configured to be coupled with a panel guide mold to fix or support the display panel.
  • the third projection 213 may be a member to support the optical members.
  • a top surface of the third projection may be a convex surface with a predetermined curvature to reduce the contact area with the optical members.
  • the optical member may be protected from an external shock.
  • a plurality of hollownesses or minute projections may be further formed in the top surface of the third projection 213.
  • FIGS. 9A to 9D are sectional views illustrating a reflection pattern formed in the first reflector.
  • the first reflector 200 may include the inclined plane 201 and the flat surface 202 formed in the back surface thereof.
  • a plurality of reflection patterns 215 may be formed on the flat surface 202.
  • the reflection pattern 215 are saw-toothed and a surface of the reflection pattern 215 is flat.
  • the reflection pattern 215 is saw-toothed and the surface of the reflection pattern 215 is curved.
  • the surface of the reflection pattern 215 is concavely curved and in FIG. 9C , the surface of the reflection pattern 215 is convexly curved.
  • the size of the reflection patterns 215 may be getting larger from an end of the first reflector 200 toward the other end thereof.
  • the size of the reflection pattern 215 may not be uniform.
  • the size of a reflection pattern 215 close to the light source module may be larger than the size of another reflection pattern 215 distant from the light source module.
  • the reason why the reflection patterns 215 are formed on the flat surface of the first reflector 200 is that uniform brightness can be provided by compensating brightness after reflecting the light toward the region having relatively low brightness, compared with the other region.
  • reflection patterns 215 may be fabricated in corresponding regions, with various sizes according to the entire brightness distribution of the backlight.
  • FIGS. 10A to 10C are sectional views illustrating the length of the first reflector.
  • the second reflector 300 may include a first region adjacent to the light source module 100 and a second region adjacent to the third region.
  • the first region of the second reflector 300 may be aligned with the light source module 100 and the first reflector and it may have a first inclined plane inclined downwardly.
  • the second region of the second reflector 300 may be a flat surface in parallel to the flat surface disposed in the back surface of the first reflector or it may include a second inclined plane inclined upwardly.
  • the back surface of the first reflector 200 may include an inclined plane 201 adjacent to the light source module 100 and a flat surface 202 adjacent to the inclined plane 201.
  • the flat surface 202 disposed in the back surface of the first reflector 200 may be aligned in at least one of the first and second regions disposed in the second reflector 300.
  • FIG. 10A illustrates an embodiment of the present invention in that the flat surface 202 disposed in the back surface of the first reflector 200 is aligned in the first region of the second reflector 300.
  • FIG. 10B illustrates an embodiment of the present invention in that the flat surface 202 disposed in the back surface of the first reflector 200 is aligned over the first region and the second region.
  • FIG. 10C illustrates an embodiment of the present invention in that the flat surface 202 disposed in the back surface of the first reflector 200 is aligned in the second region of the second reflector 300.
  • the length of the first reflector 200 may be variable according to various present inventions.
  • FIGS. 11A to 11D are sectional views illustrating an arrangement relation between the light source module and the first and second reflectors.
  • FIG. 11A illustrates the light source module 100 spaced apart a predetermined distance from the first and second reflectors 200 and 300.
  • FIG. 11B illustrates the light source module 100 in contact with the first and second reflectors 200 and 300 simultaneously.
  • FIG. 11C illustrates the light source module 100 spaced apart a predetermined distance from the second reflector 300, in contact with the first reflector 200 simultaneously.
  • FIG. 11D illustrates the light source module 100 spaced apart a predetermined distance from the first reflector 200, in contact with the second reflector 300 simultaneously.
  • the light source module 100 may be spaced apart a first distance (d1) from the first reflector 200 and a second distance (d2) from the second reflector 300.
  • first distance (d1) and the second distance (d2) may be the same or different from each other.
  • the first distance (d1) may be smaller than the second distance (d2).
  • first distance (d1) is larger than the second distance (d2), a hot spot may be generated.
  • the light source module 100 may be in contact with the first reflector 200 and the second reflector 300.
  • the light source module 100 may be in contact with the first and second reflectors 200 and 300, to prevent the hot spot and to transfer the light to a region distant from the light source 100 to reduce the overall thickness of the backlight unit.
  • the light source module 100 may be in contact with the first reflector 200 and it may be spaced apart a predetermined distance (d) from the second reflector 300.
  • the light source module 100 may be in contact with the first reflector 200, to prevent the hot spot and to transfer the light to a region distance from the light source module 100.
  • the light source module 100 may be in contact with the second reflector 300 and it may be spaced apart a predetermined distance (d) from the first reflector 200.
  • FIGS. 12A to 12C are sectional views illustrating the second reflector including the inclined plane and the flat surface.
  • FIG. 12A illustrates the inclined plane of the second reflector 300 is flat and FIG. 12B illustrates the inclined plane of the second reflector 300 is concavely curved.
  • FIG. 12C illustrates the inclined plane of the second reflector 300 is convexly curved.
  • a first region of the second reflector 300 may be the inclined plane and a second region may be the flat surface.
  • FIGS. 13A to 13C are sectional views illustrating the second reflector including a plurality of inclined planes.
  • two neighboring inclined planes have flat surfaces, respectively.
  • two neighboring inclined planes have concavely curved surfaces and the curvatures of the two inclined planes are different from each other.
  • two neighboring inclined planes have convex curved surfaces and the curvatures of the two inclined planes are different from each other.
  • the second reflector 300 may include a first region adjacent to the light source 100 and a second region distant from the light source module 100.
  • first region and the second region of the second reflector 300 may be inclined planes.
  • a specular-reflection sheet may be formed on the first region of the second reflector 300 to specular-reflect the light. At least one of the specular-reflection sheet and scattered-reflection sheet may be formed on the second region of the second reflector 300.
  • the reason why the specular-reflection sheet is formed on the first region of the second reflector 300 is that uniform brightness can be provided by reflecting more light toward the central region of the second reflector 300 having lower brightness.
  • the reason why the scattered-reflection sheet is formed on the second region of the second reflector 300 is that the lower brightness can be compensated by scattered-reflecting the light in the second region of the second reflector 300 having the lower brightness.
  • the second reflector 300 may include a metal material or a metal oxide with a high reflectivity such as Al, Ag, Au and TiO 2 .
  • the materials forming the first and second regions of the second reflector 300 may be different from each other and surface roughness of the first region may be different from surface roughness of the second region.
  • the first and second regions of the second reflector 300 may be formed of the same materials, with a different surface roughness.
  • first and second regions of the second reflector 300 may be formed of different materials, and surface roughness of them may be different from each other simultaneously.
  • the second reflector 300 may be a reflection coating film or a reflection coating material layer having a reflection material deposited thereon.
  • the second reflector 300 may include at least one of a metal material and a metal oxide.
  • the second reflector 300 may include a metal material or a metal oxide with a high reflectivity such as Al, Ag, Au and TiO 2 .
  • the second reflector 300 may be formed by depositing or coating the metal material or the metal oxide on a polymer resin frame 430 that is a bottom plate or it may be formed by printing metal ink.
  • the depositing method may be thermal deposition, vapor deposition or vacuum deposition such as sputtering.
  • the coating or printing method may be printing, gravure printing or silk printing.
  • the second reflector 300 may be a film or sheet and it may be bonded on the polymer resin frame.
  • the second reflector 300 may have the structure having a unilayer with the uniform reflectivity formed on an entire region of the polymer resin frame that is the bottom plate.
  • the second reflector 300 may have the structure having multi-layers with different reflectivity, respectively, formed on the entire region of the polymer resin frame.
  • the reason why the second reflector 300 includes the multi-layers with the different reflectivity is that the overall brightness of the backlight might fail to be uniform because the light reflectivity of the overall reflection surface is not uniform in case of forming only the reflection layer having the same reflectivity.
  • a reflection layer with a relatively high reflectivity may be formed on a region with a high brightness in the reflection surface or a reflection layer with a relatively low reflectivity may be formed on a region with a higher brightness in the reflection surface. Because of that, the overall brightness of the backlight may be compensated uniformly.
  • FIG. 14 is a diagram illustrating a backlight unit having an optical member disposed thereon.
  • an optical member 600 may be disposed, spaced apart a predetermined distance from the second reflector 300.
  • An air guide is formed in the space between the second reflector 300 and the optical member 600.
  • an unevenness pattern 620 is formed on a top surface of the optical member 600.
  • the optical member 600 may be configured to disperse the light emitted from the light source module 100 and the unevenness pattern 620 may be formed to increase a dispersion effect.
  • the optical member 600 may be configured of a plurality of layers and the unevenness pattern 620 may be disposed on the uppermost layer or a surface of one of the layers.
  • the unevenness pattern 620 may have a strip shape disposed along the light source module 100.
  • the unevenness pattern 620 may include projected portions projected from the surface of the optical member 600 and each of the projected portions may be configured of a first surface and a second surface facing each other.
  • An angle formed between the first surface and the second surface may be an acute angle or an obtuse angle.
  • the optical member 600 may be configured of at least one sheet and it may selectively include a diffusion sheet, a prism sheet or a brightness enhancement sheet.
  • the diffusion sheet may diffuse the light emitted from the light source and the prism sheet may guide the diffused light toward a luminescence region.
  • the brightness enhancement sheet may enhance brightness.
  • the second reflector 300 may include at least one of a metal material and a metal oxide.
  • the second reflector 300 may include a metal material or metal oxide with a high reflectivity such as al, Ag, Au or TiO 2 .
  • the second reflector 300 may be formed of a reflection coating film or a reflection coating material layer and it may be employed to reflect the light generated in the light source module 100 toward the optical member 600.
  • the second reflector 300 may have a saw-toothed reflection pattern formed on a surface thereof facing the optical member 600.
  • the reflection pattern may be a flat surface or a curved surface.
  • the reason why the reflection pattern is formed on the surface of the second reflector 300 is that the light generated in the light source module 100 can be diffused and reflected uniformly.
  • the reflector for air guiding may include the flat surface or the inclined plane. Because of that, the weight of the backlight unit may be reduced and the fabricating cost of the backlight unit may be lowered. Also, the backlight unit may provide uniform brightness.
  • the economic feasibility and reliability of the backlight unit may be enhanced.
  • FIG. 15 is a diagram illustrating a display module including the backlight unit according to the present inventions mentioned above.
  • a display module 20 may include a display panel 800 and a backlight unit 700.
  • the display panel 800 may include a color filter substrate 810 and a thin film transistor substrate 820 (TFT) that are bonded to maintain a uniform cell gap, facing each other.
  • a liquid crystal layer (not shown) may be disposed between the two substrates 810 and 820.
  • a top polarization plate 830 and a bottom polarization plate 840 may be disposed on and under the display panel 800, respectively. More specifically, the top polarization plate 830 may be disposed on a top surface of the color substrate 810 and the bottom polarization plate 840 may be disposed under the TFT substrate 820.
  • gate and data driving parts may be disposed in both sides next to the display panel 800 to generate a driving signal used to drive the panel 800.
  • FIGS. 16 and 17 are diagrams illustrating a display device according to an present invention.
  • a display device 1 may include a display module 20, a front cover 30 and a back cover 35 surrounding the display module 20, a driving part 55 disposed in the back cover 35 and a driving cover 40 surrounding the driving part 55.
  • the front cover 30 may include a front panel (not shown) formed of a transparent material to transmit light.
  • the front panel may protect the display module 20, spaced apart a predetermined distance from the display module 20, and transmit the light emitted from the display module 20 to enable an image displayed on the display module 20 visible outside.
  • the back cover 35 may be coupled to the front cover 30, to protect the display module 20.
  • the driving part 55 may be disposed on a surface of the back cover 35.
  • the driving part 55 may include a main control part 55a, a main board 55b and a power supply part 55c.
  • the driving control part 55a may be a timing controller and it may be driving part that adjusts an operation timing of each driver IC disposed in the display module 20.
  • the main board 55b may be a driving part that transmits V-synch, H-synch and R, G and B resolution signals to the timing controller.
  • the power supply part 55c may be a driving part that applies an electric voltage to the display module 20.
  • the driving part 55 may be disposed in the back cover 35 and it may be surrounded by the driving part cover 40.
  • a plurality of holes may be disposed in the back cover 35, to connect the display module 20 and the driving part 55 with each other.
  • a stand 60 may be disposed in the back cover 35 to support the display device 1.
  • a driving control part 55a of the driving part may be disposed in the back cover 35 and the power board 55c of the main board 55b may be disposed in the stand 60.
  • the driving part cover 40 may cover only the driving part 55 disposed in the back cover 35.
  • the main board 55b and the power board 55c may be independently disposed or they may compose a single integration board, and this present invention is not be limited thereto.
  • the embodiments described above may include the reflector for air guide that includes the inclined plane partially, without a light guide plate.
  • the weight of the display device may be reduced and the fabrication cost of the display device may be lowered. Also, the uniform brightness may be provided.
  • the economic feasibility and reliability of the backlight unit may be enhanced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
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EP12153286.5A 2011-07-29 2012-01-31 Backlight unit and display device using the same Active EP2551705B1 (en)

Priority Applications (1)

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EP14188882.6A EP2840421B1 (en) 2011-07-29 2012-01-31 Lighting system

Applications Claiming Priority (1)

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KR1020110075995A KR101824039B1 (ko) 2011-07-29 2011-07-29 디스플레이 장치

Related Child Applications (2)

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EP14188882.6A Division-Into EP2840421B1 (en) 2011-07-29 2012-01-31 Lighting system
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EP (2) EP2551705B1 (ko)
JP (2) JP5944176B2 (ko)
KR (1) KR101824039B1 (ko)
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JP2013033708A (ja) 2013-02-14
CN102901000B (zh) 2018-02-02
EP2840421B1 (en) 2016-06-01
CN102901000A (zh) 2013-01-30
US20140328059A1 (en) 2014-11-06
KR20130014005A (ko) 2013-02-06
JP2016149379A (ja) 2016-08-18
US8814417B2 (en) 2014-08-26
JP5944176B2 (ja) 2016-07-05
US20140092585A1 (en) 2014-04-03
TW201305681A (zh) 2013-02-01
JP6163232B2 (ja) 2017-07-12
US8616754B2 (en) 2013-12-31
EP2551705A1 (en) 2013-01-30
US9110333B2 (en) 2015-08-18
US20130027966A1 (en) 2013-01-31
TWI546593B (zh) 2016-08-21
EP2840421A1 (en) 2015-02-25
KR101824039B1 (ko) 2018-01-31

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